Good sealing performance, no air leakage when connected to the cylinder, and more convenient to use.Mainly used as a threaded adapter for machine cylinders, it can also be used as a gas source switch.Made of high-quality materials, with high hardness, wear resistance, and long service life.Tight threads, exquisite technology, stable performance, easy installation and useIf you want to use a steam TR21-4 bottle instead of a Quooker cube bottle, you can use this adapter.Thread: Tr21-4 female to Tr12-3 male.Tip: The product may be constantly updated, and due to different batches, there may be slight differences or color variations in the actual product, which does not affect its useColor: Photo colorMaterial: CopperPackaging content: 1 x CO2 gas converter, only the above packaging content is included, other products are not included.Attention: Reflection of light and different displays may cause slight differences in color between the items in the picture and the real ones. The allowable measurement error is+/-1-3cm.